You're not using correct syntax. The first problem line, auto numbers3 = [ 1,
2, 3, 4][];, doesn't work because you forgot a comma. I think you want auto to
be evaluated as int[][], however, you have two arrays without a comma
seperator. It should be like this:
auto numbers3 = [ 1, 2, 3, 4], [];
The second line has the same problem, as well as it's improperly declared. It
should be declared as int[][].

You're not using correct syntax. The first problem line, auto numbers3 = [ 1,
2, 3, 4][];, doesn't work because you forgot a comma. I think you want auto to
be evaluated as int[][], however, you have two arrays without a comma
seperator. It should be like this:
auto numbers3 = [ 1, 2, 3, 4], [];
The second line has the same problem, as well as it's improperly declared. It
should be declared as int[][].

I was trying create a dynamic array of ints in the same way that
"hello"[] creates a dynamic array of chars. Maybe I'm mixing up array
and string syntaxes?
Gide